William l



(No Model.)

- W. L. SWEETLAND.

CHUCK JAW.

No. 414,955. Patented Nov. 12, 1889.

. .I l i l E l UNITED STATES PATENT FFICE.

IVILLIAM L. SWEETLAND, OF NEIV HAVEN, CONNECTICUT, ASSIGNOR TO THE I-IOGGSON & PETTIS MANUFACTURING COMPANY, OF SAME PLACE.

CH UCK-JAW.

SPECIFICATION forming part of Letters Patent No. 414,955, dated November 12, 1889.

Application filed July 15, 1889. Serial No. 317,562. (No model.)

To aZZ whom it may concern.-

Be it known that 1, WILLIAM L. SWEET- LAND, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Chucks; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, a side View of the jaw and base;

2, a perspective view of the base detached; Fig. 3, a perspective view of the jaw detached. Figs. 2 and 3 are on a reduced scale.

This invention relates to an improvement in that class of chucks in which two or more jaws are arranged to slide radially on the face, the jaws constructed with several shoulders, each adapted to bear upon an article placed therein, the several shoulders adapt-- ing the chuck to hold various sized articles. The shoulders in the jaws are formed by off- 2 5 sets on the face of the jaws. When the jaws are set with the shoulders facing inward, they grasp upon the exterior of the article to be produced; but if the shoulders are set to face outward, then the jaws are adapted to engage with the interior of the article to be held by the jaws.

In some cases chucks are constructed only for engaging upon the outside or periphery of the thing to be held. In other cases they 3: are constructed to engage with the interior only of the article to be held. In other cases the jaws are made reversible, so that the same jaw in one position may engage upon the pe riphery of the article, or reversed will engage upon the interior of the article. It is to this latter class of jaws that my invention particularly relates.

.As hitherto generally constructed the reversible jaws have been secured by screws through the jaws directly into the jaw-seat, and so that the strain upon the jaws came substantially upon the screws.

The object of my invention is to take the strain produced by the clamping operation of the jaws entirely from the screws and bring it'between the jaw and the seat which holds it, and so as to be substantially the same as if the jaw wereau integral part of its seat; and it consists in making the jaw in two partsthat is, the jaw proper and its seatthe adjacent faces of the jaw and seat the one constructed with double undercut transverse projection and the other with a corresponding double undercut transverse groove,

so that the jaw may be set into its seat trans- 6o versely and making a hook engagement therewith in bot-h directions, and so that the jaw may be reversed for either an inside or outside grip.

In illustratingthe invention I show the jaw only. The head andadj usting devices, being common and well known,do not require illustrat-ion.

The jaw is made in two parts, A representing the seat, which is constructed with a shank B, extending into the face of the chuck to engage with the adjusting mechanism, and is constructed with two offsets or shoulders a b. Transversely across the seat portion A a double undercut groove d is formed, as seen in Fig. 2, and preferably of dovetail shape, and on the jaw portion C acorresponding projection e is formed, undercut upon its ends corresponding to the under-cut of the groove, and so that the said projection of the jaw portion 0 may be set transversely into the groove d of the base A, as seen in Fig. 1, and so as to firmly interlock in both directionsthat is, against strain at either end of the jaw in both a radial and axial direction. The groove and the projection are formed in a central position on the parts and so that the jaw may be set into its seat either end outward, as represented in Fig. 1, the representation in full lines, Fi 1, being so thatgo the shoulders will grasp upon the exterior of the article to be held, and the position in broken lines so that the shoulders will engage upon the interior of the article to be held. 7

\Vith the jaws thus constructed, the clamp- 5 ing force brought upon the jaws to hold the article is resisted by the undercut connection between the jaw audits seat, and, the fit of the projection into the groove being properly made, the jaw cannot give way. under the grasping strain brought upon it, and is practically as firm as if made an integral part of the seat. Yet it is easily reversible for either the inside or the outside grasp by simply sliding it transversely from its seat, inverting-it, and then returning it to its place, and as indicated in broken lines, Fig. 1.

One or more screws, as D, may be introduced through the face of the jaw to prevent accidental transverse movement; but these are not required to take any of the strain which comes upon the jaws radially or axially, as in grasping an article. The length of the projection and groove on the adjacent faces of the jaw and its seat is immaterial, it only being essential that the undercut projection and the undercut recess shall be such that the jaw may be introduced either end outward-that is, so as to be reversible. Additional under-cuts maybe made, as indicated in broken lines, Fig. 1, and the undercut may be of any suitable shape, so as to make the undercut engagement between the parts. Itwill be evident, without illustration, that the projection maybe on either part and the undercut groove on the other part.

From the foregoing it will be understood that I do not claim, broadly, a jaw for chucks made in two parts, the one part forming a base radially guided and adjustable on the chuck-head, the other part constructed with shoulders and secured to the base, so that said shouldered portion of the jaw may be set in position for either an inside or outside grasp.

What I do claim is- The herein-described jaw for chucks, consisting of the base A, adapted for connection with the adjusting devices, and the jaw 0., its face constructed with offsets forming shoulders, and the adjacent surfaces of the jaw and its base constructed the one with an undercut transverse projection and the other with a corresponding undercut transverse groove, the said undercut groove and projection being adapted for the introduction of the jawto the base either end outward, substantially as described.

WILLIAM L. SWEE'ILAND.

\Vitnesses:

W. J. HOGGSON, FRED C. EARLE. 

